If you've been running this old reliable operating system for the last decade (like we have, on at least one computer), it's time to think about migrating to System 7 or 8.1, or some other operating system like Linux, if your hardware will work with it. (Windows Vista will be supported for a couple more years as well, but this OS is generally derided. Windows 7 is recommended if you don't have a touch screen.)

If you keep running XP, Microsoft says your computer will become vulnerable to security risks, and eventually some software may stop working.

Unfortunately, when you migrate to a new operating system, some of your old applications may not be compatible.

Alas, older computers may not support the newer, memory-hogging operating systems.

This means you may have to buy a new computer, or see if your old one can be upgraded. (There is software that helps you do
that. Here's the story of the upgrade of a 2005 laptop.)

If you are a big organization and have to migrate a lot of computers, you have to get started right away because it's a glitchy process. Here's some advice for you.

If you don't know your operating system, right click on "My Computer" or "Computer," then click on "Properties."